Venturi mixer nozzle



Jan. 19, 1965 E. E. cooK 3,166,020

VENTURI MIXER NOZZLE Filed Sept. 20. 1961 25' i, f w 25 1 3/6 \27 5 44 319 T 23' r L Y.

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INVENTOR. Ernesz 5. Cook BY 4 United States Patent Ofifice I 3,166,020Patented Jan. 19, 1965 tion, there exists :a tendency of some of thedissolved particles to settle out and collect at the bottom of thesolution container. This tendency to settle out is one of the problemsencountered when wettable powders such as spraying suspensions aresuspended in tanks of water and then are sprayed on fruit trees, growingvegetables and the like.

So that a homogeneous mixture is sprayed when the solution tank is fullor empty, a means of constant agitation is often required. This may takethe form of propellers, bubbling of the solution, etc.

When a sprayer is mounted on a vehicle and has its own associated pump,a common practice to maintain thorough and continuous agitation is toby-pass a portion of solution being pumped from the pump outlet and toallow the by-passed solution to return to the solution container Whereit is discharged through a venturi nozzle. The venturi nozzle, whenpositioned near the bottom of the container, will draw the settlingparticles and surrounding liquid into the venturi whereafter it isdischarged therefrom with appreciable agitation.

Present commercial designs of the mixer-type venturi nozzle comprehend asingle self-contained venturi unit.

The entire unit is cast as a sand casting and thus requires extensivemachining to smooth certain portions. Also, when venturi nozzles of thepresent design are manufactured, troublesome and expensive coringoperations are required in order to form the necessary openings andchambers. Therefore, it is a general object of this invention to providea venturi nozzle which is comprised of an assemblage of parts that areeasily fabricated into a final configuration with a minimum of expenseand time involved.

More specifically, it is an object of this invention to provide animproved venturi pipe which is highly economical and easy tomanufacture.

Another object of this invention is to provide an efficient venturinozzle which is assembled in a very few simple components and thus lendsitself to ready replacement of individual parts.

A further object is to provide a by-pass venturi nozzle which lendsitself to interchangeability of orifice Washers thereby providingvariations in venturi eifect to accommodate fluid suspensions ofdifierent viscosities and concentrations of solids.

These and other objects and advantages of this invention will more fullyappear from the following description, made in connection with theaccompany drawing, wherein like reference characters refer to the sameor similar parts throughout the several views and in which:

FIGURE 1 is a diagrammatic view of a typical solution pumping systemincorporating a venturi nozzle;

FIGURE 2 is an enlarged cross-sectional side view of the venturi nozzleassembly shown in disassembled arrangement;

FIGURE 3 is a replaceable element of the assembly shown in FIGURE 2;

FIGURE 4 is a full cross-sectional view of FIGURE 2 taken on line 4-4;and

' FIGURE 5 is a side view of the venturi nozzle having inlet and outletpipes shown in fantom drawing and'typical solution flow representedduring actual operation.

Referring again now to FIGURE 1, a typical pressure spraying system 9 isshown, having a pump 10 which is suppliedvia supply line 11 withsolution 12 from tank 13. for discharging through spray nozzle 14. Thesolution is generally a mixture of wettable powder and water.

Feeding the outlet pipe 15, to pump 10, is a by-pass pipe 16 which leadsinto tank13and connects directly to the venturi nozzle assembly referredto generally as 17. Venturi nozzle assembly 17 in turn has connected atthe upper outlet end a discharge pipe 18.

Referring now more particularly to FIGURES 2, 3 and 4, the detaileddesign of this invention will-be explained.

The nozzle assembly 17 is comprised of four elements; namely, a venturipipe 19, an orifice disc 20, a retainer washer 21 and a reducer coupling22.

The venturi pipe 19, as seen in FIGURE 2, is a onepiece molded elementof material such as high impact plastic which has a forwardfrusto-conioal housing 23 a which in turn is secured to a rear'housing24 by means of four bridging columns 25.

The forward housing 23 has an expansion chamber 26 defined by side wall27. The expansion chamber is also of a frusto-conioal shape terminatingupwardlyin discharge opening 28 and terminating rearwardly in aconstriction 29. Forming a part of the forward housing 23 and continuouswith the expansion chamber is the entrance chamber 30 being of a reversefrusto-conical shape to that of expansion chamber 26 and being definedby side Wall 31. Entrance chamber 30 terminates forwardly inconstriction 29 and rearwardly in entrance opening 32. The purpose ofthe entnance chamber 30 being shaped with a rearwardly directedfrusto-conical opening, is to provide an efficient design for receivingthe fluid from by-pass pipe 16 and simultaneously to draw in a portionof the surrounding suspension 12 as will be explained subsequently.

Axially aligned with the entrance chamber 30 and expansion chamber 26,and spaced rearwardly of the entrance chamber opening 32, is an orificechamber 33 which is contained within rear housing 24. As seen in FIGURE2, the orifice chamber has a disc opening 34 which terminates rearwardlyin a shoulder 35." Shoulder 35 provides a seating means for the orificedisc 20. The open space'between the entrance opening 32 and disc opening34 defines an open venturi chamber 36. I

As seen inFIGUREZ, the rearward housing 24 is furnished .with a threadedmeans for retaining the reducer coupling 22 therein when the orificedisc 20 is properly seated within orifice chamber 33.

The orifice disc 20 has an outside surface configuration which coincideswith that of orifice chamber 33. Internally, orifice disc 20 has afrusto-conically shaped passageway 37 defined by annular wall 38. Aretainer Washer 21 is provided next in the assembly sequence so that theforward end 39 of reducer coupling 22 may gently urge the orifice disc20 against the shoulder 35 of the orifice chamber 33. Reducer coupling22 is therefore threaded at 40 for engagement with rear housing 24. Therearward portion of reducer coupling 22 is also threaded at 41 forsecurement to by-pass pipe 16 (see FIGURE 1). As seen in FIGURE 2,reducer coupling 22 has a partial constriction 42 intermediate its endswhich increases the fluid velocity and also provides a standard couplingfor hose or pipes.

As described above, FIGURE 4 is a full cross-sectional view of FIGURE 2and shows the four bridging columns 25 with respect to the outsidedimensions of the rearward housing. FIGURE 2 also shows the disc opening34. The rearward housing external surface is shaped in hex- 7 likedimensions.

cosities or mixture densities, it may also be desirable to use varioussized orifice discs as shown.:

gaged with the'by-pass pipe 16 at the lower threaded portion 41 and theventuri pipe 19 connected at the forward end by means of threadedportion 43 to a discharge pipe will pass fronrthe by-pass pipe 16"through the orifice disc 20 and,: under increasedpressure, but reducedvolume,

With a particular sized orifice discincluded in .the ori-" fice chamber33, and a particular pressure of fluid being 1 pumped therethrough, apredetermined amount of fluid 4 ing an orifice chamber terminatingforwardly in a shouldered opening at a fixedlocation spaced from anddisposed in alignment with said expansion chamber, a plurality ofbridging columns interconnecting said forward housing and said rearwardhousing to thereby form an open venturi chamber therebetween in whichfluids will be mixed when a pressurized fluid is forced intosaidexpansion chamber from said orifice chamber, said assemblage furtherhaving an orifice disc removably seated within said orifice chamber andseated'against said shouldered opening, and a means threadedly receivedin into the venturi pipe expansion chamber 26. With the fluid underpressure, the natural tendencyof the ,venturi pipe will be to drawsurrounding solution 12 as indicated by arrows 44. The fluid flowthrough the orifice disc is representedby arrows 45. By reference toFIGURE 4, it may be readily seen that there is sufiicientopen spacebetwen bridging columns 25 for adequatefluid flow, to enter the openventuri chamber 36.

, Because of the novel design of this invention, the characteristicsof'the venturi may be easily changed by simply removing the reducercoupling and retainer washer and thereafter inserting a new-orifice disc46 having a larger opening 47, such as that shown in FIGURE 3. lin thisinstance, with the new orifice disc installed, a larger volume of waterunder lower pressure would be forced into the expansion chamber 26 thustaking with it, via the open venturi chamber, a larger quantity of'surrounding solution 12. Likewise, if an orifice disc becomes said jorifice chamber for retaining said orifice disc in seated relationinsaid orificechamber.

, '2. A venturi mixer assemblage comprising, a venturi pipe having, aforward housing defining an axial open ended expansion chambertherethrough, a rearward hous-- ing having an open ended orifice chamberin axial alignment with the axis of said expansion chamber and spacedrearwardly therefrom, said rearward housing having a shouldered seat atits forward opening, an orifice disc removably seated on said shoulderedseat and aligned with both said orifice chamber'fand said expansionchamber a means threadedly engaging said orifice' chamber for retainingsaid orifice disc in seated position, and circumferentially spacedbridging meansfor securing in fixed relation said forward housing tosaid rearward housing.

3. Atventuri mixer assemblage comprising, a venturi pipe having aforward housing defining an open ended frusto-conical expansion chamber,a rearward housing having. an open ended orifice chamber, said expansionchamber and orifice chambers being axially aligned and spaced from eachother, a-plurality of bridging columns damaged or worn, it maybe easilyreplaced with one of Depending upon the solution of visconstructionwithinexpensive and durable material. .It'

is also seen that the assemblage provides for interchange ability of anyof the parts with a minimum of efiort and timeconsumption. There are noexpensive moldings required and likewise no expensive machiningoperations after the items are molded before .they'may be used inactualioperation; I

- It will, of course, be understood that various changes may be made inthe form, details, arrangements and' proportions of the parts withoutdeparting from the scope of the invention as set forth. in the appendedclaims I claim: V e p 1. A venturi mixer assemblage comprising, aventuri pipe having a forward housing defining an elongated fixedlysecuring said forward housing to said rearwardhousing, a removableorifice disc axially aligned and positioned in said orifice chamber,said rearward housing further having ashoulder inwardly of its forwardopening for seating said orifice disc and thread means adjacent itsrearward opening, and an annular removable means in threaded engagementwith its rearward opening and retaining said orifice disc seated on saidshoulder, whereby said retaining means may be removed and said orificedisc replaced with a like element having a different sized orificeopening. 7

References Cited in the file of this patent UNITED ,STATES PATENTS642,046

2. A VENTURI MIXER ASSEMBLAGE COMPRISING, A VENTURI PIPE HAVING AFORWARD HOUSING DEFINING AN AXIAL OPEN EMDED EXPANSION CHAMBERTHERETHROUGH, A REARWARD HOUSING HAVING AN OPEN ENDED ORIFICE CHAMBER INAXIAL ALIGNMENT WITH THE AXIS OF SAID EXPANSION CHAMBER AND SPACEDREARWARDLY THEREFROM, SAID REARWARD HOUSING HAVING A SHOULDERED SEAT ATITS FORWARD OPENING, AN ORIFICE DISC REMOVABLY SEATED ON SAID SHOULDEREDSEAT AND ALIGNED WITH BOTH SAID ORIFICE CHAMBER AND SAID EXPANSIONCHAMBER A MEANS THREADEDLY ENGAGING SAID ORIFICE CHAMBER FOR RETAININGSAID ORIFICE DISC IN SEATED POSITION, AND CIRCUMFERENTIALLY SPACEDBRIDGING MEANS FOR SECURING IN FIXED RELATION SAID FORWARD HOUSING TOSAID REARWARD HOUSING.